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Compare the volume of tracked traffic before and after a launch or campaign. This example compares August and September 2026 in UTC. Use periods of similar length, or compare the daily averages calculated below.

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The total counts stored sessions, rather than unique people. A person can contribute several sessions. Device counts include sessions with a recorded device category, which may total less than overall sessions. The query uses only visitsByMonth.total; the example calculates its own averages from the UTC periods. For a zero baseline, the percentage change is null. If you choose local periods across a daylight-saving change, choose explicitly whether to compare elapsed 24-hour units or local calendar days.